Super-premium Mobil Polyrex™ EM Series greases are specially formulated for electric-motor bearings. The advanced thickener formulation and proprietary manufacturing techniques provide improved bearing performance and protection for long electric motor life.

Delivery and return
Delivery and return
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Shipping Information
Shipping Information

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Composition and care
Composition and care
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Description

Super-premium Mobil Polyrex™ EM Series greases are specially formulated for electric-motor bearings. The advanced thickener formulation and proprietary manufacturing techniques provide improved bearing performance and protection for long electric motor life.

Features and Benefits

Mobil Polyrex EM and Mobil Polyrex EM 103 offer the following features and benefits:

Features Advantages and Potential Benefits
Outstanding                        grease life  

Outstanding long-life, high-temperature lubrication of ball and roller bearings, particularly in sealed-for-life applications

Advanced                     polyurea thickener  

Increased durability versus conventional polyurea greases when subjected to mechanical shear forces.

Excellent                    corrosion resistance Mobil Polyrex EM and Mobil Polyrex EM 103 provide protection against rust and corrosion.Mobil Polyrex EM provides additional protection under mild salt-water wash conditions versus Polyrex EM 103
Low-noise properties Mobil Polyrex EM is suitable for lubrication of ball bearings in many noise-sensitive applications.
Applications

Mobil Polyrex EM greases are recommended by many major bearing and electric motor manufacturers for long-life lubrication of electric motor ball and roller bearings.

Mobil Polyrex EM 103 is more specifically recommended for applications such as vertically mounted bearings, or very large motors where a stiffer grease consistency may be required by the OEM.

Mobil Polyrex EM greases have been shown to be compatible with a number of ExxonMobil lithium complex greases, as well as competitive electric motor mineral polyurea products, as determined by the methodology of ASTM D6185. For specific questions about grease compatibility, contact your Mobil representative.

Key applications include:

  • Electric motor bearings
  • Fin fan bearings
  • High-temperature pump bearings
  • Factory-filled, sealed-for-life ball bearings.
  • Ball or roller bearings operating at high temperatures where low oil separation is required.
  • Mobil Polyrex EM for ball or roller bearings operating in noise sensitive environments.
Specifications and Approvals
This product meets or exceeds the requirements of: MOBIL POLYREX EM
DIN 51825:2004-06 – K 2 P -20 X
Properties and Specifications
Property MOBIL POLYREX EM MOBIL POLYREX EM 103
Grade NLGI 2 NLGI 3
Thickener Type Polyurea Polyurea
Color, Visual Blue Blue
Copper Strip Corrosion, 24 h, 100 C, Rating, ASTM D4048 1A 1A
Corrosion Preventive Properties, Rating, ASTM D1743 Pass Pass
Dropping Point, °C, ASTM D2265 260 270
Four-Ball Wear Test, Scar Diameter, mm, ASTM D2266 0.41 0.6
Low Temperature Torque, Running, -29 C, g-cm, ASTM D1478 405 910
Low Temperature Torque, Starting, -29 C, g-cm, ASTM D1478 3630 5840
Lubrication Life @ 177 C, h, ASTM D3336 750+ 750+
Oil Separation, 0.25 psi, 24 h @ 25 C, mass%, ASTM D1742 0.5 0.1
Penetration, 60X, 0.1 mm, ASTM D217 285 250
Penetration, Change from 60X to 100,000X, 0.1 mm, ASTM D217 40 40
SKF Emcor Rust Test, 10% Synthetic Sea Water, ASTM D6138 0, 1
Viscosity @ 100 C, Base Oil, mm2/s, ASTM D445 12.2 12.2
Viscosity @ 40 C, Base Oil, mm2/s, ASTM D445 115 115
Viscosity Index, ASTM D2270 95 95
Water Washout, Loss @ 79 C, wt%, ASTM D1264 1.9 0.8

 

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